There is no argument that this is the world's best e-reader already, so the discussion is really around what version to buy, since having one should be a given. It is far beyond any competition. And although I LOVE the feel of a book, I have learned to love this even more, with easy word lookups, marking passages, finding relevant information and incredible lighting and reading experience for my aging eyes. And several thousand books in a 7.2oz package is awful nice.
UPDATE! Just figured something out that many people probably know already. Was travelling in Brazil, and learning Portuguese, and stopped in a store to get a book. They are 3x the price in the states, so I thought, "I wonder if that is on Kindle?" Well, I am happy to say that all the Portuguese books I could ever want are on Kindle Unlimited. But the best thing is it also automatically downloads a dictionary, so when you hold down on one of the unfamiliar words, BOOM! there is the definition, what an ideal tool to round out language study! Loving it! Chapter 5 of Harry Potter, here we go!
DON'T HAVE A KINDLE PAPERWHITE? If you don't have an e-reader, have a different brand e-reader, or have a Kindle that is not a paperwhite, then this version is a valuable upgrade to you. It is light, easy to hold, simple to operate, and is the closest thing to a book 'experience' as you can get. It is incredibly easy to read at a beach with no glare, or at night. I use my Kindle everywhere in many conditions, and have never looked back. The price gap, at least for the moment, is only $10 between the new Kindle PW and the previous version, so it makes sense to buy the new one. However, keep an eye on it, and if the price drops further for the previous gen, it is not really compelling enough to spend the extra $$$ for this brand new one.
ALREADY HAVE AN OLDER PAPERWHITE? So, if you already have a paperwhite, is this 2015 upgrade worth it?
Consider COST first – it is $119 w/ special offers, no 3G. Then you add $20 if you want no special offers, and another 70 (plus about 5% extra weight) for 3G. That extra $90 buys a lot of books!
*Buy 3G? I find internet access pervasive nearly everywhere, and have not used my 3G at all. I buy the books ahead of time, and if I actually ran out of books on a trip, it would not be unanticipated, and I would certainly have some internet access at some point. I simply don't find the 3G to be something I need, even for a small price.
*Likewise for SPECIAL OFFERS...they do not interfere with reading at all, they are pretty unobtrusive, and I have even found a couple to be of interest and have made a purchase decision from that.
Then COMPARE. I love this compared to my original paper white. There really is no comparison, and if you have, and love, your original, this is a great upgrade. It is lighter, crisper, has great adjustable lighting, more memory and features, it is well worth $119 to upgrade, and give the other to a family member or friend.
BATTERY life. I started with this new Kindle PW and my old Kindle PW charged up fully. After using each for a couple hours, I noticed no difference in the battery degradation. Obviously this is not a scientific test, and the chance for variance is high, but Amazon says you can still get several weeks of life from this new Kindle, and I see no reason to doubt that. Mathematically, the battery spec provided by Amazon shows a slight decrease, but I still charge my Kindle once every week or two just to make sure I don't run out, and that has always worked out just fine for me.
CLARITY: If you have the 2nd generation paperwhite (late 2013): it is a more difficult choice. Personally, I think it is worth it, but definitely not compelling if you are short on funds. The increase in PPI from 212 to 300 is noticeable, as is the pleasant new font Bookerly. The main thing for me, however, is actually this new Bookerly font. It is much easier to read. I started wearing reading glasses about 6 years ago, and in comparisons with my other PW, I can read effectively at one size smaller font due to font clarity and gentle contrast on a better screen. That may not seem like much, but I appreciate less page turning and interruptions. YMMV.
Big IF - If your eyesight depends on HIGHER CONTRAST, the new Kindle PaperWhite is actually not as bright as the last gen PW. I have included side by side pictures to demonstrate this. The new PW seems more like a book to me, with its nice gentle light. In the pictures, I have used the same font, same brightness, etc., so that you can see the detail for yourself. The new Kindle is on the right.
OVERALL, this is a worthwhile upgrade for anyone who does not already have a 2nd generation PW. If you have a 2nd generation already, it might be something you do only if the specific need is there, or if you want to give your old one away.
Finally, what about the WARRANTY? When these devices were $399 plus, maybe getting an extended warranty was worthwhile. But with the prices continually falling, and the likelihood that one will actually fail extremely slim (I have had only one instance, and Amazon replaced it immediately), I would personally recommend against the purchase. Seems silly to insure a $100 device that has a low failure rate, spending an extra $19 for year, or up to $39 for 3 years of extended coverage.
TIPS:
Do yourself a huge favor and get a case.
Password protect your screen. If someone gets your Kindle, they can spend your money and make lots of problems.
SMALL UPDATE: I have been using this to send documents to for reading, mostly PDFs. It is functional, but if you require good reading of PDFs, then you probably won't like it that much, and you would be better off with a traditional tablet. The issue is that the font is exceedingly small, and there is no way to expand or enlarge that I have found. You can make the font slightly larger by entering landscape mode, but then the flow is off. I also end up with an occasional crash of the browser.